/*
 * The contents of this web application are subject to the Mozilla Public License Version 
 * 1.1 (the "License"); you may not use this web application except in compliance with 
 * the License. You may obtain a copy of the License at http://www.mozilla.org/MPL/.
 * 
 * Software distributed under the License is distributed on an "AS IS" basis, 
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 
 * for the specific language governing rights and limitations under the License.
 * 
 * The Original Code is owned by and the Initial Developer of the Original Code is 
 * Composite A/S (Danish business reg.no. 21744409). All Rights Reserved
 * 
 * Section 11 of the License is EXPRESSLY amended to include a provision stating 
 * that any dispute, including but not limited to disputes related to the enforcement 
 * of the License, to which Composite A/S as owner of the Original Code, as Initial 
 * Developer or in any other role, becomes a part to shall be governed by Danish law 
 * and be initiated before the Copenhagen City Court ("K�benhavns Byret")            
 */

using System.Collections;
using System.Collections.Generic;


namespace Composite.Core.Collections.Generic
{
    /// <summary>    
    /// </summary>
    /// <exclude />
    [System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Never)] 
	public class Hashset<T>
	{
        private readonly Hashtable _table = new Hashtable();

        /// <exclude />
        public Hashset()
        {
        }

        /// <exclude />
        public Hashset(IEnumerable<T> enumerable)
        {
            foreach (T element in enumerable)
	        {
	            Add(element);
	        }
        }

        /// <exclude />
        public bool Contains(T key)
        {
            return _table.ContainsKey(key);
        }

        /// <exclude />
        public void Add(T key)
        {
           _table.Add(key, string.Empty);
        }

        /// <exclude />
        public void Remove(T key)
        {
           _table.Remove(key);
        }

        /// <exclude />
	    public ICollection<T> GetKeys()
	    {
            var result = new List<T>();

            foreach(object key in _table.Keys)
            {
                result.Add((T)key);
            }
            return result;
	    }
	}
}